People with asthma frequently use products and to reduce their exposure to environmental triggers of asthma. These web sites provide information on buying selected consumer products and services.
Association of Home Appliance Manufacturers & Clean Air Delivery Rate
All air cleaners filter the air at different efficiency levels and flow rates. The Association of Home Appliance Manufacturers (AHMA) established a standardized measurement system, the Clean Air Delivery Rate, which determines how well an air cleaner reduces pollutants such as tobacco smoke, pollen and dust. Using this information AHAM calculates the maximum room size for the air cleaner.
Air cleaning devices are intended to remove pollutants from indoor air. Some air cleaning devices are designed to be installed in the ductwork of a home’s central heating, ventilating, and air-conditioning system to clean the air in the whole house. Portable room air cleaners can be used to clean the air in a single room or specific areas, but they are not intended for whole-house filtration. The following publication provides information on different types of air cleaning devices and how they work.
Ozone generators that are sold as air cleaners intentionally produce the gas ozone. Often the vendors of ozone generators make statements and distribute material that lead the public to believe that these devices are always safe and effective in controlling indoor air pollution. For almost a century, health professionals have refuted these claims. The purpose of this document is to provide accurate information regarding the use of ozone-generating devices in indoor occupied spaces. This information is based on the most credible scientific evidence currently available.
Knowledge about air duct cleaning is in its early stages, so a blanket recommendation cannot be offered as to whether you should have your air ducts in your home cleaned.
California Environmental Protection Agency
California Air Resources Board: Hazardous Ozone-Generating “Air Purifiers”
Not all air-cleaning devices are appropriate for home use — some can be harmful to human health. The California Air Resources Board recommends that ozone generators, air cleaners that intentionally produce ozone, not be used in the home. Ozone is a gas that can cause health problems, including respiratory tract irritation and breathing difficulty.